How to detect Facebook Like button pressed and trigger event?

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借酒劲吻你
借酒劲吻你 2021-02-06 16:01

Here is the example:

  • http://www.facebook.com/UEvents?v=app_4949752878&ref=ts

These guys get people to click on Like button (in Step 1) first bef

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  • 2021-02-06 16:33

    When a Facebook tab is loaded, the fb_sig_is_fan parameter is passed in specifying if the current user viewing the tab is a fan. Clicking on the Like button will trigger a reload of the tab content, resulting in an updated fb_sig_is_fan being passed in so the app can decide to show a different image.

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  • 2021-02-06 16:35

    http://developers.facebook.com/docs/reference/javascript/FB.Event.subscribe/

    FB.Event.subscribe('edge.create', function(response) {
    // do something with response.session
    });
    
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  • 2021-02-06 16:44

    Actually information if user is page fan or not exists in signed request. Since you need firstly to decode signed request like it is here:

     $signed_request = $_REQUEST["signed_request"];
     list($encoded_sig, $payload) = explode('.', $signed_request, 2); 
     $data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
    

    And after that access page liked variable:

    $pageLiked = $data['page']['liked'];
    

    Now FB is on the way of deprecating FBML so don't consider <fb:visible-to-connection> as something that will work for a long base.

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  • 2021-02-06 16:48
    <fb:visible-to-connection>
    put here code for users that like the page (no <fb:comments>) 
    </fb:visible-to-connection>
    
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  • 2021-02-06 16:51

    One can detect when a user clicks on like button using edge.create. Also if the user has already liked the page, it can detected using FQL Like Table.

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